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Polymers and Polymer Composites

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Title: PROPERTIES OF THERMOPLASTIC POLYURETHANE/FUNCTIONALISED GRAPHENE SHEET NANOCOMPOSITES PREPARED BY THE IN SITU POLYMERISATION METHOD
Page Range: p.351-358
Author(s): Duc Anh Nguyen; Raghu A V; Jin Taek Choi; Han Mo Jeong
File size: 323K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.7

Abstract
Thermoplastic polyurethane (TPU)/functionalised graphene sheet (FGS) nanocomposites were prepared by an in situ polymerisation method. The synthesised TPU/FGS nanocomposites were fully characterised by FTIR, TEM, TGA, DSC, DMA, and by measurements of electrical conductivity and mechanical properties. The results indicated that the chemical and/or physical interactions between FGS and TPU were enhanced in the nanocomposites prepared by the in situ polymerisation method, and were compared to those of an earlier study which were prepared by physical mixing. Thermogravimetry showed that the degree of TPU adherence onto the FGS increased when the nanocomposite was prepared by the in situ polymerisation method. There were pronounced modulus enhancements and decreases in tensile strength and elongation at break as a result of incorporating FGS. The FGS, well dispersed in the TPU matrix, effectively improved the electrical conductivity; the nanocomposite containing 2 parts FGS per 100 parts TPU had an electrical conductivity of 2.07-10-3 S/cm, about 108 times higher than that of the pristine TPU. 44 Refs.

Title: AN EXPERIMENTAL APPARATUS FOR MEASUREMENT OF ELONGATIONAL FLOW PROPERTIES FOR LDPE MELT AND THE EFFECT OF TESTING CONDITIONS
Page Range: p.359-368
Author(s): Watcharin Sitticharoen; Naret Intawong; Narongrit Sombatsompop
File size: 483K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.7

Abstract
An experimental rig was designed and constructed for melt strength measurement and was assembled at the end of a single screw extruder used for the production of low-density polyethylene (LDPE) melt. The experimental rig was coupled with a high speed data logging system and a personal computer for the real-time measurement of melt strength. The molten LDPE was extruded through a capillary die, forming a continuous filament before being pulled down by speed-adjustable mechanical rollers until the filament failed. A digital camera was used for measuring the actual extrudate size at failure point. The drawdown forces as a function of volumetric flow rate from the extruder, roller speed, die temperature and take-up style were of interest in this study. It was found that the experimental rig could be used for accurate measurement of the mechanical strength for the LDPE melt. The experimental results suggested that the melt strength of LDPE was dependent upon the volumetric flow rate through the die from the screw extruder, roller speed, and the take-up style. For ladder-step take-up, increasing roller speed resulted in non-linear increases in the drawdown forces, the drawdown force changes being associated with the molecular disentanglement and elastic resistances of the branched LDPE melt. The drawdown forces of the LDPE melt measured under the rapid speed take-up method were 40-60% greater than those tested under the ladder-step speed take-up method, depending on the volumetric flow rate used in the screw extruder. The tensile viscosity of the LDPE melt was found to decrease slightly with strain rate and die temperature in the testing conditions used in this work. 25 Refs.

Title: INTERFACIAL SHEAR STRENGTH IN A METAL-THERMOPLASTIC COMPOSITE
Page Range: p.369-380
Author(s): Ochoa Putman C; Vaidya U K
File size: 556K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.7

Abstract
Hybrid materials featuring thermoplastic polymer composites in conjunction with steel cords are being considered as structural materials in infrastructure, transportation and military applications. The present study focuses on understanding the mechanical performance of metal cord-thermoplastic composites. Since the optimal performance of a composite strongly depends on the behaviour of the interface, finite element modelling has been adopted to characterize the interface between steel fibres and thermoplastic composite material. The mechanical interactions between thermoplastics and steel have been studied with a goal to improve interfacial shear strength and cohesive strength. Steel cord was combined with nylon, polypropylene, soft thermoplastic polyurethane and hard thermoplastic polyurethane to find the parameters that affect mechanical bonding via pull out tests and friction coefficient tests. The test parameters have been correlated to interfacial shear strength using both experimental and modelling approach. 22 Refs.

Title: DEGRADATION AND DYNAMIC PROPERTIES OF POLY(AMIDE-CO-IMIDE)/CARBON NANOTUBE COMPOSITE FILMS
Page Range: p.381-390
Author(s): Seung Hwan Lee; Sheong Hyun Choi; Seong Yun Kim; Jin Il Choi; Jae Rock Lee; Jae Ryoun Youn
File size: 345K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.7

Abstract
Poly(amide-imide) (PAI)/carbon nanotube (CNT) composite films were investigated through FT-IR spectroscopy, TGA, and DMTA measurements in order to understand the interrelationships of surface modification of CNTs, thermal imidisation time, and thermal stability after they were prepared by solution mixing. Thermal stability and glass transition temperature were significantly improved when the PAI/CNT nanocomposites were filled with hydrogen peroxide treated CNTs (p-CNT) because the dispersion of p-CNTs and interfacial bonding between p-CNT particles and PAI molecules were improved. The imidisation time of the PAI/p-CNT composite film needed for sufficient imidisation reaction was reduced by about 3 hours compared with that of the pure PAI film, because p-CNTs have higher thermal conductivity than the pure PAI resin. They also showed the highest glass transition temperature among all PAI/CNT composites since p-CNTs have many hydrophilic functional groups which yield strong interaction with PAI molecules. It was found that the thermal imidisation depended on the network structure which was generated by the crosslinking reaction and surface modification of CNTs. 26 Refs.

Title: PREPARATION OF RECYCLED POLY(VINYL ALCOHOL) (PVA)/IODINE POLARIZING FILM
Page Range: p.391-396
Author(s): Man Ho Han; Jae Kyun Shin; Kyeong Il Oh; Young Jae Lee; Du Hyun Song; Yong Sik Chung; Yong Rok Lee; Han Gon Choi; Tae Hwan Oh; Sung Soo Han; Seok Kyun Noh; Won Seok Lyoo
File size: 226K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.7

Abstract
To precisely identify the effect of preparation conditions on the polarizing efficiency (PE) of recycled poly(vinyl alcohol) (PVA)/iodine complex film, PVA film and PVA/iodine polarizing film were prepared by using recycled nonwoven PVA with a number-average degree of polymerisation (Pn) of 1700, syndiotactic diad (s-diad) content 54.6%, and degree of saponification (DS) 97.6%. We investigated the effects of various conditions such as soaking time, temperature of I2/KI aqueous solution, draw ratio, and temperature of aqueous boric acid solution on the transmittance and PE of recycled PVA/iodine complex film. Maximum transmittance and PE values of recycled PVA/iodine complex film were 41.2% and 99.8%, respectively. It was found that the recycled PVA/ iodine polarizing film showed effective transmittance and PE values comparable with those of commercial PVA/ iodine polarizing film. 19 Refs.

Title: PREPARATION OF SODIUM ALGINATE HYDROGEL MICROPARTICLES BY ELECTROSPINNING USING VARIOUS TYPES OF SALTS
Page Range: p.397-404
Author(s): Sun Gil Kim; Young Jae Lee; Eun Joo Shin; Yeong Soon Gal; Yong Rok Lee; Tae Hwan Oh; Han Gon Choi; Jung-Ae Kim; Chul Soon Yong; Sung Soo Han; Seok Kyun Noh; Won Seok Lyoo
File size: 478K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.7

Abstract
Sodium alginate (SA) hydrogel microparticles were simply obtained by using electrospinning method at diverse processing parameters such as polymer concentration, applied voltage, tip to collector distance (TCD), and type and amount of divalent cations (crosslinking and gelation agents). In the case of TCD, there is no significant on the morphological shape of SA hydrogel microparticle. On the contrary, the particle size was decreased with an increase in the applied voltage. But at a high applied voltage, the polydispersity of SA hydrogel microparticle was increased and broad range of particle sizes was observed. Nearly monodisperse microparticles were prepared at applied voltage of 10kV. We also obtained SA hydrogel microparticles by the exchange of sodium ions with divalent cations such as Sr2+ and Ba2+, which presented uniform spherical shape, in comparison with that prepared using Ca2+. 23 Refs.

Title: UV-CURED EPOXY METHACRYLATE COMPOSITE CONTAINING FLUORINE AND SILOXANE
Page Range: p.405-410
Author(s): Chunyi Tang; Weiqu Liu
File size: 336K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.7

Abstract
The synthesis and characterisation of methacryloxysiloxane (MAS) were described. UV-curable composites, bisphenol-A epoxy methacrylate/2,2,3,4,4,4-hexafluorobutyl methacrylate (BEMA/HFMA) and BEMA/HFMA/MAS composite systems were built, and the preparation method is described. The effects of HFMA and MAS content on the surface properties, thermal behaviour and water resistance of the cured composite films were investigated by contact angle, TGA and DSC, water resistance ratio; the dispersion of the three components was observed by micromorphological examination, and the results are discussed. 16 Refs.

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